#!/bin/sh
# Copyright (C) 2012 Luka Perkov <freecwmp@lukaperkov.net>

# TODO: LIMITATIONS: we only handle one device router at the moment

# ordering of routes:
#  1) inactive routes found in uci network config file
#  2) active routes found in uci network config file
#  3) active routes but not found in uci network config file

FREECWMP_DEVICE_ROUTES="/tmp/freecwmp_routes"
FREECWMP_DEVICE_ROUTES_STATIC="/tmp/freecwmp_routes_static"
FREECWMP_DEVICE_ROUTES_DYNAMIC="/tmp/freecwmp_routes_dynamic"

get_device_routing_ipv4_check_route() {
	local __uci_target=$1
	local __uci_gateway=$2
	local __uci_netmask=$3

	local __active=0

	# TODO: remove this file
	echo -n > $FREECWMP_DEVICE_ROUTES_DYNAMIC

	local __route_target
	local __route_gateway
	local __route_netmask
	local line
	while read line
	do
		__route_target=`echo -n $line | awk '{ print $1 }'`
		__route_gateway=`echo -n $line | awk '{ print $2 }'`
		__route_netmask=`echo -n $line | awk '{ print $3 }'`
		if [ "x$__uci_target" != "x$__route_target" ]; then
			echo $line >> $FREECWMP_DEVICE_ROUTES_DYNAMIC
			continue
		fi
		if [ "x$__uci_gateway" != "x$__route_gateway" ]; then
			echo $line >> $FREECWMP_DEVICE_ROUTES_DYNAMIC
			continue
		fi
		if [ "x$__uci_netmask" != "x$__route_netmask" ]; then
			echo $line >> $FREECWMP_DEVICE_ROUTES_DYNAMIC
			continue
		fi
		echo $line >> $FREECWMP_DEVICE_ROUTES_STATIC
		__active=1
	done < $FREECWMP_DEVICE_ROUTES

	eval "export -- \"$4=\"\"$__active\"\"\""
}

get_device_routing_ipv4_ordering_information() {
	local _static=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} show network 2> /dev/null | grep '=route$' | wc -l`
	local _active=`cat $FREECWMP_DEVICE_ROUTES | wc -l`
	local _inactive=0

	local _uci_target
	local _uci_gateway
	local _uci_netmask
	local _route_active

	local i
	let local _count=$_static-1
	for i in `seq 0 $_count`
	do
		_uci_target=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].target 2> /dev/null`
		_uci_gateway=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].gateway 2> /dev/null`
		_uci_netmask=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].netmask 2> /dev/null`
		get_device_routing_ipv4_check_route "$_uci_target" "$_uci_gateway" "$_uci_netmask" "_route_active"
		if [ $_route_active -ne 1 ]; then
			let _inactive=$_inactive+1
		fi
	done

	let local _total=$_active+$_inactive
	eval "export -- \"$1=\"\"$_total\"\"\""
	eval "export -- \"$2=\"\"$_active\"\"\""
	eval "export -- \"$3=\"\"$_inactive\"\"\""
	eval "export -- \"$4=\"\"$_static\"\"\""
}

get_device_routing() {
local parameter=$1

case "$parameter" in
	Device.Routing.RouterNumberOfEntries)
	freecwmp_output "$parameter" "1"
	return
	;;
esac

local rc
local num

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.Enable" "rc" "num"
if [ $rc -eq 0 ]; then
	local val
	if [ $num -eq 1 ]; then
		val="1"
	else
		val="0"
	fi
	freecwmp_output "$parameter" "$val"
	return
fi

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.Status" "rc" "num"
if [ $rc -eq 0 ]; then
	local val
	if [ $num -eq 1 ]; then
		val="Enabled"
	else
		val="Disabled"
	fi
	freecwmp_output "$parameter" "$val"
	return
fi

# TODO: Device.Routing.Router.{i}.Alias (alias support does not exist)

# TODO: remove this file
route -n | grep -v '^Kernel ' | grep -v '^Destination ' > $FREECWMP_DEVICE_ROUTES

local total
local active
local inactive
local static

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4ForwardingNumberOfEntries" "rc" "num"
if [ $rc -eq 0 ]; then
	if [ "x$num" == "x1" ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
	else
		return
	fi
	freecwmp_output "$parameter" "$total"
	return
fi

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv6ForwardingNumberOfEntries" "rc" "num"
if [ $rc -eq 0 ]; then
	local val
	if [ $num -eq 1 ]; then
		val=0
	else
		return
	fi
	freecwmp_output "$parameter" "$val"
	return
fi

# TODO: Device.Routing.Router.{i}.IPv4Forwarding.{i}.Enable

# TODO: routes can not be disabled, they should be disabled by default
freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.Status" "rc" "num"
if [ $rc -eq 0 ]; then
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			freecwmp_output "$parameter" "Enabled"
			return
		fi
		if [ $num2 -le $inactive ]; then
			freecwmp_output "$parameter" "Error: not active but enabled"
			return
		fi
		if [ $num2 -le $static ]; then
			freecwmp_output "$parameter" "Enabled"
			return
		fi
	else
		return
	fi
fi

# TODO: Device.Routing.Router.{i}.IPv4Forwarding.{i}.Alias (alias support does not exist)

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.StaticRoute" "rc" "num"
if [ $rc -eq 0 ]; then
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			freecwmp_output "$parameter" "0"
			return
		fi
		if [ $num2 -le $static ]; then
			freecwmp_output "$parameter" "1"
			return
		fi
	else
		return
	fi
fi

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.DestIPAddress" "rc" "num"
if [ $rc -eq 0 ]; then
	local target
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			let local _num=$num2-$static
			local _sed_cmd=`echo -n \'$_num; echo p\'`
			target=`eval sed -n $_sed_cmd $FREECWMP_DEVICE_ROUTES_DYNAMIC | awk '{ print $1 }'`
		elif [ $num2 -le $static ]; then
			let local i=$static-$num2
			target=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].target 2> /dev/null`
		fi
		freecwmp_output "$parameter" "$target"
		return
	else
		return
	fi
fi

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.DestSubnetMask" "rc" "num"
if [ $rc -eq 0 ]; then
	local netmask
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			let local _num=$num2-$static
			local _sed_cmd=`echo -n \'$_num; echo p\'`
			netmask=`eval sed -n $_sed_cmd $FREECWMP_DEVICE_ROUTES_DYNAMIC | awk '{ print $3 }'`
		elif [ $num2 -le $static ]; then
			let local i=$static-$num2
			netmask=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].netmask 2> /dev/null`
		fi
		freecwmp_output "$parameter" "$netmask"
		return
	else
		return
	fi
fi

# TODO: Device.Routing.Router.{i}.IPv4Forwarding.{i}.ForwardingPolicy

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.GatewayIPAddress" "rc" "num"
if [ $rc -eq 0 ]; then
	local gateway
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			let local _num=$num2-$static
			local _sed_cmd=`echo -n \'$_num; echo p\'`
			gateway=`eval sed -n $_sed_cmd $FREECWMP_DEVICE_ROUTES_DYNAMIC | awk '{ print $2 }'`
		elif [ $num2 -le $static ]; then
			let local i=$static-$num2
			gateway=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].gateway 2> /dev/null`
		fi
		freecwmp_output "$parameter" "$gateway"
		return
	else
		return
	fi
fi

# TODO: Device.Routing.Router.{i}.IPv4Forwarding.{i}.Interface

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.Origin" "rc" "num"
if [ $rc -eq 0 ]; then
	local val
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			val="Unknown"
		elif [ $num2 -le $static ]; then
			val="Static"
		fi
		freecwmp_output "$parameter" "$val"
		return
	else
		return
	fi
fi

freecwmp_parse_formated_parameter "$parameter" "Device.Routing.Router.{i}.IPv4Forwarding.{i}.ForwardingMetric" "rc" "num"
if [ $rc -eq 0 ]; then
	local metric
	local num1=`echo $num | awk '{ print $1 }'`
	local num2=`echo $num | awk '{ print $2 }'`
	if [ $num1 -eq 1 ]; then
		get_device_routing_ipv4_ordering_information "total" "active" "inactive" "static"
		if [ $num2 -le 0 ]; then
			return
		fi
		if [ $num2 -gt $total ]; then
			return
		fi
		if [ $num2 -gt $static ]; then
			let local _num=$num2-$static
			local _sed_cmd=`echo -n \'$_num; echo p\'`
			metric=`eval sed -n $_sed_cmd $FREECWMP_DEVICE_ROUTES_DYNAMIC | awk '{ print $5 }'`
		elif [ $num2 -le $static ]; then
			let local i=$static-$num2
			metric=`/sbin/uci ${UCI_CONFIG_DIR:+-c $UCI_CONFIG_DIR} get network.@route[$i].metric 2> /dev/null`
		fi
		freecwmp_output "$parameter" "$metric"
		return
	else
		return
	fi
fi

}
